package com.imooc.security.core.validate.code.image;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.context.request.ServletWebRequest;

import com.imooc.security.core.properties.SecurityProperties;
import com.imooc.security.core.validate.code.ValidateCode;
import com.imooc.security.core.validate.code.ValidateCodeGenerator;

public class ImageCodeGenerator implements ValidateCodeGenerator {
	
	private SecurityProperties securityProperties;
	
	@Override
	public ValidateCode createImageCode(ServletWebRequest request) {
		//图片的长和高
		//从request中获取参数名为width的值，获取不到的话使用securityProperties.getCode().getImage().getWidth()
		int width = ServletRequestUtils.getIntParameter(request.getRequest(), "width", 
				securityProperties.getCode().getImage().getWidth()); 
//				int height = 23;
		//使用配置
		int height =ServletRequestUtils.getIntParameter(request.getRequest(), "height", 
				securityProperties.getCode().getImage().getHeight()); 
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		Graphics g = image.getGraphics();

		Random random = new Random();

		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("Times New Roman", Font.ITALIC, 20));
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		String sRand = "";
		/*
		 * for (int i = 0; i < securityProperties.getCode().getImage().getLength(); i++)
		 * { String rand = String.valueOf(random.nextInt(10)); sRand += rand;
		 * g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 +
		 * random.nextInt(110))); g.drawString(rand, 13 * i + 6, 16); }
		 */
		
		for (int i = 0; i < securityProperties.getCode().getImage().getLength(); i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand += rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 16);
		}
		
		
		g.dispose();

//				return new ImageCode(image, sRand, securityProperties.getCode().getImage().getExpireIn());
		return new ImageCode(image, sRand, securityProperties.getCode().getImage().getExpireIn());
	}
	
	/**
	 * 生成随机背景条纹
	 * 
	 * @param fc
	 * @param bc
	 * @return
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255) {
			fc = 255;
		}
		if (bc > 255) {
			bc = 255;
		}
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

	public SecurityProperties getSecurityProperties() {
		return securityProperties;
	}

	public void setSecurityProperties(SecurityProperties securityProperties) {
		this.securityProperties = securityProperties;
	}

}
